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ISSN Druckformat: 1065-5131
ISSN Online: 1563-5074
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DESIGN EQUATIONS OF FLOW CONDENSATION IN SMOOTH AND MICRO-FIN TUBES WITH HCFC-22, HFC-134A AND HFC-410 REFRIGERANTS
ABSTRAKT
An empirical study of single-phase convection and flow condensation heat transfer in horizontal tubes was conducted. Three refrigerants (HCFC-22, HFC-134a and HFC-410A), a smooth tube, and three micro-fin tubes (axial, helical and Crosshatch enhancement) were examined. Commonly cited correlations were evaluated, utilizing the experimental data obtained in Part I of this study. Although these correlations had fairly good agreement with HCFC-22 and HFC-134 results, all of them failed to predict HFC-410A performance. A modified Shah equation was developed for smooth tube annular flow condensation, which overcomes the shortcomings of the existing correlations. Furthermore, design equations were developed for single-phase heat transfer and two-phase condensation with all three micro-fin tubes investigated, and covering all three refrigerants tested.